Connection for electrical terminals.



A. C. TAYLOR. CONNECTION FOR ELECTRICAL TEHMINALS. APPLICATION FILED JUNE 2.'I9I3.

SI. Paten-ted Dec. 14, 191:3.

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Patented Dec. 14, 1915.

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@TATES ALBERTIS C. TAYLOR, OF WARREN, OHIO, ASSIGNOR TO THE 'WINFIELD MNUFAC- TUBING COMPANY, OF WARREN, OHIO, A CORPORATION.

CONNECTION FOR ELECTRICAL TERMINALS.

Application led xTune 26, 1913.

To all whom t may concern.'

Be it known that I, ALBnn'rIs C. TAYLOR, citizen of the United States, residing .at Warren, in the county of Trumbull and State of Ohio, have invented certain new and useful Improvements in Connections for Electric Terminals, of which the following is a specification.

This invention has reference to a connection for electric terminals, and the invention is specially applicable to electrlc welding machines and is adapted to overcome existing objections and to provide material advantages as hereinafter shown' and described.

In the accompanying drawings, Figure l is an elevation of a simple form of machine in which this invention ais employed. Fig. 2 is a plan view, considerably enlarged, of the upper welding member or terminal and a portion of the secondary electric-currentconducting band thereon, and Fig. 3 1s an edge View of Fig. 2.

The novelty herein resides more particularly in that portion of the machine which comprises the solid copper terminals or holders 2 and 3, the secondary bands or conductors i and 5 of the transformer and the welding electrodes 6 and 7. These elements are operatively associated in and form a part of a machine having a transformer 8 and which is particularly described and claimed in a concurrent application bearing Ser. No. 775,890, the said machine being also outlined in Fig. 1 of this application. The invention is also applicable to buttwelding machines.

Specifically, the invention herein consists in the original and novel construction of the said terminals or holders 2 and 3 and in the bands 3 and 4f, in that both holders have stepped ends for making engagement of the said secondarybands therewith.l Heretofore devices of this general character in this class of machines have been made by superimposed or laminated bands of dat sheet copper of the same length in each band and laid flat one upon the other their entire length and upon the ends of terminals corresponding to 2 and 3, but in all such constructions the serious objection has arisen that the lower or innerl strip of the band has had to bear the burden of the current and was liable to become over-charged and heated because it alone was in direct or im- Specification of Letters Patent.

Patented Dec. ist, i915.

lSerial No. 775,891.

mediate contact with the terminal member while the other strips or layers above came' into the circuit with indirect contacts and as mere layers one upon the other secured by bolts through all the layers into the terminals and each introducing a measure of resistance proportioned to its distance from the bottom strip. The invariable experience pressure which had to be borne practically f.

entirely by one thin strip of the band and the consequent heating and resistance in the band as described.

The present invention is directed tothe .overcoming or remedying of this vital objection, and, as above indicated, lies in the terminals or holders 2 and 8 which have their ends provided with a series of graduated steps a and b respectively. The holder 2 has three steps on each side, bottom and top, and the holder 3 has three steps on top,

but there might be more and on both sides also.

The advantage of stepping the holder and using copper strips or plates of different end lengths according to the said steps is obl vious inview of the former difliculty above described when all the strips in the band were laid one upon the other at the ends, because each step afi'ords an additional direct contact surface for one of the several strips of the bands and there are atleast'three such contacts instead of only one as formerly, and siX in holder or-terminal 2 counting both sides. When this manner of building up and connecting'said bands ispractised the number'of direct contacts is not only increased but all the other strips which overlie the primary strip in each step are materially enhanced in efiiciency and thus the entire band is brought up to a substantially uniform current-carrying value and there is no such loss or depreciation of current and over-heating of the bands as formerly when this manner of making connections was unknown. r

The bands 4: and 5 are divided at their ends into groups of two or more of the constitutent strips according to the depth of the said steps or recesses, and the said strips vary in length according to the particular step they are'V to occupy, the inner strips being shortest and overlapped by the next o'uter strips to the de'pth of the next succeeding step and so on. Plates 10 and bolts T12 which pass through said ends and the said strips and holders bind the parts rmly together. The length of the riser of the inner or last ste is far greater than the others as itis designed to have plate 10 abut l special clamping jaw 14: is provi ed for the upper 'welding electrode 6. To this end the holder Ior terminal 2, which is a solid piece of copper, has a recess formed in itsside and end .with an inclined bottom m running 'down to the -center of the hole 15 for said electrode and a shoulder 'n atvthe top of said incline, and the clamp or jaw 14 abuts against the said shoulder'and rests on or nearly on the surface m when fastened upon said electrode. A portion of the recess for the electrode is provided in the jaw 14 and the other portionin the holder 2, and a v single screw -16 and nut 17 fasten the Ajaw in place. The holder 2 being of copper the most practical way of providing a fastening therein for said jaw is to permanently screw the bolt 16 into the holder and secure the jaw .by the nut 17 -on the outer end of said bolt. The jaw itself is sleeved on said bolt and may be removed by first removing' nut 17 and leaving the bolt in its fixed position.

What I claim is:

1. In an electric machine,aterminal member having a graduated stepped end and a conducting connection therefor comprising superimposed flat conducting strips of graduated length affixed in overlapping relations upon each other and said stepped end, and means to bind said parts together.

2. In an'electric machine, a terminal member having a plurality of'steps on opposite sides at one end thereof and a connection comprising a series of fiat conducting jstrips laid on each of said'steps successively, and

means tosecure said strips upon said member.`

3. In electric machines, a terminal connection having a clamping device at one end and a steppedLsurface on each side at its other end, in combination with a series of flat conductors mounted upon each stepped surface, and plates and means to affix the ends' of said conductors in overlapping relations upon the stepped end of said holder.

In testimony whereof I affix my signature in presence of two witnesses. y

1 ALBERTIS C. TAYLOR. Witnesses:

JEssIE G. GATES, W. D. BYARD. 

